JPH01227330A - Sealing device for curved type fluorescent lamp - Google Patents

Abstract

PURPOSE:To make the heat-solftening of a sealing section of a glass tube uniform without rotating the glass tube by softening a flared circumferential edge portion of each of electrode mounts with flames blown out of a pair of ring burners, sandwiching the softened portion between a welding plate having a specified shape of annular recess and the glass tube, forming and sealing them. CONSTITUTION:Each electrode mount 3 is held with a valve chuck. Under that condition, a rotary table moves. Each ring burner 32 is ignited. The flared circumferential edge portion 4 of the electrode mount 3 and both end opening portions 2 of a glass tube 1 above the ring burner are heated with the flames blown out. When the softened circumferential edge portion 4 is softened in this way, a welding plate 36 repeats ascents and descents by the action of a roller 41. The welding position of the flared circumferential edge portion 4 and the both end openings 2 of the glass tube 1 are pressed and formed into a required shape by an annular recess 36A provided on the welding plate 36. They are sealed and welded together during the above process.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a sealing device for a bent fluorescent lamp, and in particular to heating the flare peripheral portion of an electrode mount that is sealed to both end openings of a glass tube. This invention relates to improvements in molding means.

[Conventional technology]

Fig. 4 is a vertical sectional view showing the main parts of a conventional sealing device disclosed in Japanese Patent Application Laid-open No. 62-223941. In Fig. 99, 11) is a glass tube bent into a U-shape from the center;
A phosphor coating is formed on the inner surface. 12) is one in which electrode mounts (3) are sealed to the waist at both end openings of this glass tube [1].

In each of these electrode mounts (3), an external conductor of a lead wire (5) is sealed to the flare peripheral edge (4), and a filament (5) is attached to the inner end of each lead (51).
6) is fixed. (7) is an exhaust pipe for evacuating the inside of the glass tube 11) after a predetermined sealing between the both ends of the glass tube 11) and the flare peripheral portion (4) of each electrode mount (3).

Also, al is the base of the sealing device, and this base α1 has a bearing α.
A swivel base (12) is incorporated through υ, and this swivel base α2 is rotated by a belt α4 hung on a pulley 03 fixed to the lower end of the swivel base.

α is a sleeve fixed to the top surface of this swivel table a3,
A pair of sliding tubes αe are vertically inserted into the sleeve 9, and mount holders αη are attached to the upper ends of each of the sliding tubes αe.

In addition, each exhaust pipe (7) above is attached to the above mount holder〇η.
When inserted into the electrode mount (3), the sliding tube aθ is inserted so as to come into contact with the inner surface of the flared portion of each electrode mount (3).
It is connected in series with the lower elevator pipe (11) through the 7 langes (2) provided at its lower end. spring.

A pair of supports installed on the top surface of the swing table σ2,
A pulp chuck (not shown) is attached to this. The structure as described above is attached, for example, to the periphery of a rotary table of a machine, and the glass tube (1) is rotated from the outer periphery by a gas burner @ to the openings 12) at both ends of the glass tube (1). Electrode mount (3)
The flare peripheral edge (4) of the electrode mount (3) is heated and softened, and the white waist portions are sealed without raising each electrode mount (3) at the same time.

[Problem to be solved by the invention]

Since the conventional sealing device is configured as described above, the position of the burner @ and the peripheral edge of the flare (4) to be heated and softened are eccentric, and the flame is blocked by the rotating support. Therefore, the sealed part is not evenly heated and softened, resulting in problems such as shape deformation of the sealed part, thermal distortion, and reduction in product yield due to occurrence of cranks. In addition, the glass tube is of a rotating drive type and requires a burner to heat the sealed portion from the outer periphery, which has the disadvantage of increasing the size of the entire device.

This invention was made to solve these problems, and aims to improve the product yield by uniformly heating and softening the sealed portion without rotating the glass tube. .

[Means to solve the problem]

In the case of this invention, the flared peripheral edge of each electrode mount that is in contact with the openings at both ends of the glass tube is uniformly softened by the flame emitted from a pair of ring burners installed oppositely to the flared edge, and this softened portion is softened. The saddle is sandwiched between a movable welding plate having a predetermined annular recess on the top surface and a glass tube, and the saddle is formed into the annular recess and molded and sealed into a predetermined shape.

[Effect]

In the case of this invention, the openings at both ends of the glass tube and the flare part (8) of the electrode mount are heated and softened by the flame emitted from the ring burner, so there is no difference in heating temperature.
In addition, the softened portion is regulated by the annular recess of a predetermined shape provided in the welding plate, so that no deformation occurs in the sealed portion.

〔Example〕

An embodiment of this invention will be described below. That is, in Figures 1, 2, and 3, the same parts as those in the conventional version in Figure 4 are given the same reference numerals, and redundant explanation will be omitted. In Figure 9, (to) is the base, (To) is a mount holder that is installed vertically through this base (To) at predetermined intervals.

Each of these mount holders (to) has a burner sleeve O
It is inserted from above the base (2) through the ring burner (2) and the ring burner (2) above it, and its lower end, which has penetrated through it, is fixed to the base (2) by each sealing ring (2) C6. has been done. (30A) is the base (
A gas supply port provided perpendicularly to the outer peripheral surface of the lower end of the base (to), and a vertical through hole (30B) provided in the center of the base (to). passes through this through hole (30B) and between the inner circumferential surface of the burner sleeve C311 on the upper end surface of the base (■) and the outer circumferential surface of the mount holder (to) that passes inside this burner sleeve, and is supplied to each ring burner.

On the other hand, on the outer periphery of each of the above-mentioned burner sleeves 0υ, a welding plate (to) that is inserted through the burner sleeve is fitted so as to be able to move forward and backward in the vertical direction, and the welding plate (to) is heated and softened. Both end openings (of each flare peripheral part (4) and glass tube 11)
2) is formed into a predetermined shape while being in pressure contact with each burner sleeve Qll.
There is a busy schedule surrounding the area. And the above welding plate (
(to) is fixedly supported on a stand (b), and is a structural button that moves forward and backward in the vertical direction together with the operating shaft (to) shown in FIG. The operating shaft (to) is moved up and down by the roller υ through the operating base (g) and through a bearing (to) provided on the base (to). The target is a spring that constantly presses the operating shaft downward.

Additionally, a brocade support is planted on top of the base.

A glass tube chuck (not shown) is held on this support f43, and these are attached to the peripheral edge of the rotary table.

Next, the operation of these items will be explained. First, attach the exhaust pipe (to) of each electrode mount (3) to each mount holder (to).
7) and the external conducting wire of the lead wire (5) are inserted to support each electrode mount (3) between them. Next, a U-shaped glass tube Ill with a phosphor coating formed on its inner surface is placed so that its openings at both ends (2) cover each of the electrical mounts (3), and positioned at a predetermined height, and the bulb is placed in this state. Supported by a chuck (not shown).

Thereafter, in this state, the rotary table 34 is moved and each ring burner ω is ignited, and the flared peripheral portion (4) of each electrode mount (3) thereon and the glass tube Il are ignited.
Both end openings (2) of l are heated by the jet flame.

As heating continues in this way, the flare peripheral edge (4) softens. At this point, the welding plate (support) is repeatedly raised and lowered by the action of the roller I4D, and the welding point between the openings (2) at both ends of the glass tube H and the flare peripheral edge (4) is is press-molded into a predetermined shape by the annular recesses (3 dA) provided in the welding plate (to) and sealed.

After this sealing, open the valve chuck, increase the amount of rise of the roller Qυ by a predetermined amount, and close the valve chuck again to make the sealed part float above each mount holder opening. The glass tube +1) is removed from the bulb chuck after slow cooling and solidification.

Although the above embodiment describes the sealing of a U-shaped fluorescent lamp, the sealing is not necessarily limited to a U-shape, but can be similarly implemented as long as the end portions of the glass tube are bent in parallel in the same direction.

〔Effect of the invention〕

Since the sealing device for a bent fluorescent lunch according to the present invention is constructed as described above, each sealing portion is heated and softened uniformly using a pair of annular recesses formed in a predetermined shape, rather than a bias force. By using a single welding plate with 100% of the pressure, predetermined softened parts can be press-formed at the same time, resulting in a uniform sealing shape, improving sealing efficiency, and making it possible to downsize the entire device. .

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the sealing device for a bent fluorescent lamp according to the present invention. 2 is a side view thereof, FIG. 3 is an enlarged vertical cross-sectional view showing the main part of FIG. 1, and FIG. 4 is a vertical cross-sectional view showing a conventional sealing device. In the figure, 11) is the glass tube, (2) is the opening, (3) is the electrode mount, (4) is the flare periphery, C3n#i burner sleeve, 33 Halling burner, and (to) the mount holder. (to) is a welding plate, and (36A) is an annular recess. In other figures, the same reference numerals indicate the same parts.

Claims (1)

[Claims] A glass tube bent in the same direction from the center and coated with a phosphor coating on the inner surface, an electrode mount with each flared peripheral edge in contact with the openings at both ends of the glass tube, and the state in which these are in contact. A ring burner is mounted on a burner sleeve fitted into the head of a mount holder placed and supported on the mount holder, and the flared periphery of each of the electrode mounts is heated and softened by the flame emitted from each of these ring burners.
The welding plate is fitted into each of the burner sleeves so as to be able to move forward and backward, and is pressed between the glass tube and a welding plate that has an annular recess of a predetermined shape surrounding each burner sleeve on its top surface, and is molded and sealed into a predetermined shape by the annular recess. 1. A sealing device for a bent fluorescent lamp, characterized in that the device is configured to prevent